#include <iostream>
#include <stack>
#include <math.h>
#include <cmath>

using namespace std;

int main() {
    double a = exp(1);  //2.71828
    cout << a << endl;

    double b = pow(3.0, 2.0);
    cout << b << endl;

    double c = ceil(2.3);
    cout << c << endl;

    double d = floor(2.3);
    cout << d << endl;

    double e = round(2.3);
    cout << e << endl;

    double f = fabs(-2.3);
    cout << f << endl;

    double g = fmax(2, 3);
    double h = fmin(2, 3);
    cout << g << "  " << h << endl;
    cout << log10(10) << endl;
}